If that's the case, then why isn't their defense the same as it is the first game around, to keep the battle impossible?

Um, well...I don't even understand your question. In the case I made, their defense wouldn't be the same if they've increased (/decreased is possible, I guess, if you unequipped things) their DEF...there are max possible stats in CC too, I'm pretty sure...Or were you just looking for someone else to respond?